Specifications

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2. Insert two AA batteries and close the batterydoor.
Note: The batteries (not included) are mainly for
backup purpose.
3. Connect the USB cable between the sensor and an
AC adapter(not included).
Note: After inserting the batteries or connecting AC
power, the sensor LED indicator will light for 3
seconds – flash once after 20s , and then flash once
per 1 minute thereafter (10 minutes if only powered
by batteries). Each time it flashes, the sensor is
transmitting data.